Wall flue



A. KINKEAD WALL FLUE Sept. 27, 1955 Filed Aug. 3, 1951 A r ron/ver 3 liebelow the plate 16 and below the neck 31 where the change in shapeoccurs. They preferably lie near the top of the rectangular portion ofthe flue pipe 15, and it is important that they lie beneath the plate16. There may also be another series of vent openings 35 through thepipes outer wall, a short distance above the lower end of the ilue 15.These vent openings 34 and 35 have a very important eifect. Hot airowing upwardly through the passageway 22 sucks in air through the vents34 and 35, thereby inducing a flow of relatively cool air inside thehouse walls 10, llland studs 13, 14 and around the pipe 15. This coolair movement aids in keeping the flue pipe 15 and the building walls 10,11 and studs 13, 14 cool and at a safe temperature.

Installation is made after framing and before the completion of thewalls. Before or after the heater 12 is put in place, the ceiling plate16 is cut out to provide an opening for the upper end of the flue 15.Then an angle plate 36 is secured at one side of the cut-out. Next theflue pipe 15 is put in position, and its anges 25 are secured to theheater 12. Then a second angle plate 37 is secured to the header 16around the cut-out, positioning the upper end of the ilue pipe 15.Clearances 38 are provided on four sides between the pipe 15 and theplates 36, 37 so that cooling air in the required quantity can flow downbetween the walls and the flue from the space above the plate 16.

' The builder can then complete the walls 10 and 11 across the studs 13,14. There will be a clearance of at least 3A; of an inch between thefiue pipe 15, and the walls.

There will be greater clearance than that between it and the studs 13,14. When the installation is completed, the ue pipe 15 will be enclosedinside the walls with its neck 31 sticking out over the ceiling plate16.

The flue pipe 15 is preferably short enough so that the openings 34-will be below the angle plates 36, 37 and long enough so that thecoupling 23 will be above them. By way of example only, it may be statedthat flues 15 may be made in 3, 4, and foot lengths which will take careof most wall installations. Such ilues may be practically any size tofit between wall studs. One size that has proven satisfactory is fiveinches across at the top coupling 23 and changing shape so itsrectangular dirnension is about 2'/s X 7%. In this particular pipe,there are seven openings 34 on each wide wall of the pipe and twoopenings on each end wall making eighteen in all. The openings 34 areabout Mi in diameter and are located about one inch below the lower endof the tapered neck 31, where the change in shape begins. There are, inthis illustrative example, the same number of openings of the same sizeas the openings 34, and they are located about 41/2 above the lower endof the flue 15. It will be obvious that these dimensions may be departedfrom and are given to illustrate a pipe that has been foundsatisfactory.

When the flue pipe 15 is in use, the hot ue gases from the heater 12pass through the flue opening 29 into the inner pipe 20. Hot air willthen rise inside the passage 22 between the pipe walls 2i) and 21. As itrises, the hot air current sucks in cool air from outside the ue pipe15, through the openings 34 and 35. This suction causes air from outsideto be sucked into the space bounded by the walls lil, 11 and studs 13,14 through the clearances 33.

This current of cool air mixes with the warm air in the passage 22 andkeeps the ilues outer wall 21 cool. It also flows past the studs 13, 14and the house walls 10, 11 and the angle plates 36, 37 and keeps themcool. Cool air is constantly drawn in from above the ceiling plates 16,and the inside of the house wall is kept cool.

What is claimed is:

l. An all-metal ue installation, in combination with two spaced-apartimperforate building walls separated by studs, a ceiling plate, and awall heater in between said walls, comprising a double-walled all-metalrectangular ue pipe having an inner rectangular iniperforate wall in CTLA 4 which the products of combustion are conveyed upwardly from saidheater up through said ceiling plate; and an outer wall spaced from saidinner wall and from said building walls and said studding and passingupwardly through a gap cut in said ceiling plate, space being providedbetween at least a portion of said outer pipe wall and said ceilingplate for the passage of air therebetween; said ue pipe having a neckstarting just above said ceiling plate and terminating in a generallyround coupling at the upper end of said flue pipe for attachment to around double-walled ue pipe, saidk outer pipe wall being provided belowsaid neck and below said ceiling plate with a plurality of perforationstherethrough whereby air is caused to flow through said perforationswhen said inner pipe wall becomes warm, which ow of air in turn causesair to ilow from above said ceiling plate to the space below saidceiling plate and between said building walls and studs adjacent said uepipe; a ilange at the bottom of said outer pipe wall adapted to providespace for attaching said flue pipe to said heater; and a plurality ofperorations in said outer pipe wall spaced a short distance above saidflange to introduce a further ow of air through the space between saidinner and outer pipe walls.

2. A ilue installation in between the studded walls of a building,including in combination with the two walls, the studding, and theceiling plate, a double-walled ilue pipe having an inner metal pipe toconvey the products of combustion and an outer metal pipe spaced from itand spaced inwardly from said building walls and said studding, bothsaid pipes passing upwardly through a gap cut in said plate; and abracket member secured to said ceiling plate and having portions toposition said flue pipe and portions providing a passage so that air canpass down from above said ceiling plate and around said outer pipe, saidouter pipe having perforations therethrough below said bracket and saidceiling plate, so that cool air will ilow down into said openings andthence up through the space between said inner and outer pipe walls.

3. An all-metal ilue installation in combination with two spaced-apartimperforate building walls separated by studs, with a ceiling plate andwith a wall heater in between said walls, comprising a double-walled,allmetal, generally rectangular flue pipe having an inner generallyrectangular irnperforate wall in which the products of combustion areconveyed upwardly from said heater to a locus above said ceiling plate;and an outer wall spaced substantially uniformly from said inner walland spaced from said building walls and said studs, and passing upwardlythrough a gap cut in said ceiling plate, space being provided between atleast a portion of said outer pipe wall and said ceiling plate for thepassage of air therebetween; said ilue pipe having a neck starting justabove said ceiling plate and terminating in a coupling at the upper endof said ue pipe for attachment to a round double-walled ilue pipe, saidouter pipe wall being provided somewhere below said ceiling plate with aplurality of perforations therethrough whereby air is caused to owthrough said perforations when said inner pipe wall becomes warm, whichilow of air in turn causes cool air to flow from above said ceilingplate to the space below said ceiling plate and between said buildingwalls and studs adjacent said due pipe.

4. An all-metal flue comprising an inner substantially rectangularelongated imperforate wall forming an inner a flue pipe and an outersubstantially rectangular elongated wall concentrically disposed withrespect to said pipe defining a passage therebetween, said pipe andpassage having the ends thereof open, the upper end portions of theinner and outer walls being tapered to form a coupling means carried bythe upper ends of said walls, said coupling means having an aperturedportion extending from the outer wall to the inner wall forming a spacermeans thereof, a lower supporting bracket carried at the lower ends ofsaid walls, said bracket having a portion extending between the innerand outer walls forming a lower spacing means therefor, said outer wallbeing provided intermediate said neck portion and said lower supportingbracket with a plurality of perforations therethrough, said perforationsbeing disposed in upper and lower sets with said upper set beingadjacent the tapered neck portion.

5. An all-metal ue comprising an inner substantially rectangularelongated imperforate Wall forming an inner flue pipe and an outersubstantially rectangular elongated wall concentrically disposed withrespect to said pipe defining a passage therebetween, said pipe andpassage having the ends thereof open, the upper end por tions of thewalls being tapered to form a neck portion terminating in asubstantially circular outlet, a coupling means carried by the upperends `of said walls adapted to attach said flue to a second ue pipe,a'lower supporting bracket carried at the lower ends of said walls, saidcoupling means and supporting bracket each having a portion thereofextending from the outer wall to the inner Wall forming upper and lowerspacing means respectively for said walls, said upper spacing meanshaving openings therethrough intermediate the inner and outer walls,said outer wall being provided intermediate said 'neck portion and saidlower supporting bracket with a plurality of perforations therethrough,said perforations being disposed in upper and lower sets with said upperset being adjacent the tapered neck portion, said lower supportingbracket having outwardly extending supporting flanges adapted to attachsaid flue to a heater for conducting the products of combustiontherefrom up through said pipe whereby air is caused to iiow throughsaid perforations and passage when said inner Wall becomes warm.

6. An all-metal flue comprising an inner substantially rectangularelongated imperforate wall forming an inner ue pipe and an outersubstantially rectangular elongated wall concentrically disposed withrespect to said pipe defining a passage therebetween, said pipe andpassage having the ends thereof open, the upper end portions of thewalls being tapered to form a neck portion terminating in asubstantially circular outlet, a coupling means carried by the upperends of said walls adapted to attach said ue to a second ue pipe, alower supporting bracket carried at the lower ends of said walls, saidcoupling means and supporting bracket each having an apertured portionthereof extending from the outer Wall to the inner wall forming upperand lower spacing means respectively for said walls, said outer wallbeing provided intermediate said neck portion and said lower supportingbracket with a plurality of perforations therethrough, said perforationsbeing disposed in upper and lower sets with said upper set beingadjacent the tapered neck portion, said lower supporting bracket havingoutwardly extending supporting anges adapted to attach said tlue to aheater for conducting the products of combustion therefrom up throughsaid pipe whereby air is caused to flow through said perforations andpassage when said inner wall becomes warm.

References Cited in the file of this patent UNITED STATES PATENTS236,141 Beecher Jan. 4, 1881 1,484,328 Heimbach Feb. 19, 1924 2,304,500Hoesli Dec. 8, 1942 2,634,720 Thulman Apr. 14, 1953

